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IS 1570 (Part 4) 40Cr4 vs GOST 4543 12HN3A

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 40Cr4 (IS 1570 (Part 4):1988) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 40Cr4 is defined under Bureau of Indian Standards (IS) (India).

As per chemical composition, IS 1570 (Part 4) 40Cr4 vs GOST 4543 12HN3A is a 66.7% match. As per mechanical properties, the match is 43.8%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With IS 1570 (Part 4) 40Cr4:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
66.7%
MECHANICAL MATCH
43.8%
OVERALL
35%
Specifications
Property IS 1570 (Part 4) 40Cr4 GOST 4543 12HN3A
Standard IS 1570 (Part 4):1988 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.09-0.16
Si (%) 0.10-0.35 0.17-0.37
Mn (%) 0.60-0.90 0.3-0.6
Cr (%) 0.90-1.20 0.6-0.9
Ni (%) Not specified 2.75-3.15
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1570 (Part 4) 40Cr4 GOST 4543 12HN3A
Tensile Strength 890-1040 MPa 850-1050 MPa
Yield Strength >=650 MPa (0.2 % proof stress) 685 MPa min
Elongation >=11% 11% min
Izod Impact >=50 J Not specified
Hardness 255-311 HBS (guidance only) 58-62 HRC (case)
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm Not specified
Typical Applications
IS 1570 (Part 4) 40Cr4
Not documented
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can IS 1570 (Part 4) 40Cr4 Be Substituted With GOST 4543 12HN3A?
IS 1570 (Part 4) 40Cr4 and GOST 4543 12HN3A share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
IS 1570 (Part 4) 40Cr4
No active listings currently.
GOST 4543 12HN3A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5600–6600 mm (220.47–259.84 in)
On M-EX Right Now
IS 1570 (Part 4) 40Cr4
0 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 40Cr4 and GOST 4543 12HN3A?
GOST 4543 12HN3A specifies Ni which is not specified for IS 1570 (Part 4) 40Cr4.
Can IS 1570 (Part 4) 40Cr4 be substituted with GOST 4543 12HN3A?
IS 1570 (Part 4) 40Cr4 and GOST 4543 12HN3A share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.